This one is easy: The 28/1.8G. The 28/1.8G is a very high performing wide angle (I own about every really good wide out there in Nikon mount at the moment, and this one surprised me at how good it is), while the 20 is an older design that while certainly workable on the newer high rez bodies, isn't anything special at all. Unless of course you strongly need the 20mm focal length, the 28 is by far the better lens in this case.

-m

High performer? Yes it's pretty good but have you noticed the atrocious focus shift it has? I would not have expected that, even at the price point.